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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ff247a244a197c39d14628820e6b1f59623a47502146e6022a3f0918dd9c25' 
  AND token = 'nSLDzTQ6Q/IZ4g4tDtHvmCSu98y8Mn0EBKk7kYjvXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}